Answer :
Answer: (E) A focused differentiation strategy
Explanation:
A focused differentiation strategy is one of the type of business strategy in which the company offering the various types of unique products or goods in the market for the purpose of fulfill the requirement of the narrow market.
The main objective of the focused differentiation strategy is that it helps in differentiate the one's company product and brand with the another companies in the market.
According to the given question, the Amy's drive- Thru company is basically using the focused differentiation strategy for the purpose of gaining the competitive advantage.
Therefore, Option (E) is correct answer.